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k in (-oo:+oo)
7/(-12) = (-11/4)*k // - (-11/4)*k
7/(-12)-((-11/4)*k) = 0
(11/4)*k+7/(-12) = 0
11/4*k-7/12 = 0 // + 7/12
11/4*k = 7/12 // : 11/4
k = 7/12/11/4
k = 7/33
k = 7/33
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